Can Years of Living in a Polluted City Permanently Affect Your Lungs? Expert Explains

Add as a preferred source on Google

For someone who has lived in a polluted city for 20 or 30 years, there is often a reassuring assumption: if breathing feels normal, the lungs must be doing fine.

That is not necessarily true.

Photo Credit: Chat GPT

The lungs are remarkably resilient organs, but they are also in constant contact with the outside environment. Every breath brings in oxygen along with whatever is suspended in the air. With long-term exposure to fine particulate matter, nitrogen dioxide, ozone and other pollutants, the respiratory system can remain exposed to inflammation and oxidative stress for years.

The question, therefore, is not simply whether pollution causes coughing or breathlessness. The bigger concern is whether years of exposure can accelerate the loss of lung function and contribute to permanent lung disease. We spoke to Dr Nalini Nagalla, HOD and Senior Consultant- Pulmonology & Sleep Disorders, KIMS- Arete Hospital, who explained the impact of living in a polluted city.

The damage can happen quietly

Photo Credit: Canva

Pollution does not always produce an obvious warning sign.

"Fine particles such as PM2.5 are small enough to travel deep into the lungs. Repeated exposure can trigger inflammation and oxidative stress in the airways and lung tissue. Over time, this can contribute to changes in lung function," said Dr Nagalla. Studies have found an association between long-term exposure to pollutants such as PM2.5 and nitrogen dioxide and lower measures of lung function in adults.

This is one reason a person can feel reasonably well while still experiencing a gradual decline in respiratory reserve.

Lung function naturally changes with age. The concern is when environmental exposures add to that decline and potentially cause it to happen faster than expected.

It is not only about COPD

Chronic obstructive pulmonary disease, or COPD, is often associated almost exclusively with smoking. Smoking remains a major risk factor, but it is not the only one.

"Long-term exposure to outdoor and household air pollution can also contribute to COPD. The risk becomes particularly relevant when exposure is combined with smoking, biomass fuel smoke, occupational dust or chemical fumes," added Dr Nagalla.

Pollution can also worsen existing asthma and increase respiratory symptoms. Someone with asthma may notice more frequent coughing, wheezing or attacks during periods of poor air quality.

"And there is another concern that deserves attention: long-term exposure to outdoor air pollution and particulate matter is associated with an increased risk of lung cancer. This does not mean that pollution exposure will inevitably cause cancer, but it is an established environmental risk that should not be ignored," explained Dr Nagalla.

Does the lung recover if pollution exposure decreases?

This is where the answer is less straightforward.

The respiratory system can recover from some of the inflammation caused by short-term exposure. Symptoms such as irritation, cough or worsening of asthma may improve when exposure decreases.

But established structural damage is different.

"If prolonged exposure has contributed to COPD, emphysematous changes or significant loss of lung function, simply moving to a cleaner environment cannot be expected to completely reverse the damage. Avoiding further exposure can nevertheless be extremely valuable because it may reduce ongoing irritation and help slow further deterioration," said Dr Nagalla.

In other words, reducing exposure is useful even after years of exposure have already occurred.

A normal day does not necessarily mean normal lung reserve

Photo Credit: Magnific

One of the reasons lung disease can go unnoticed is that the body has considerable reserve.

A person may be able to walk around the house, commute to work and perform routine activities without difficulty even though lung function has started to decline. Breathlessness may only become apparent during brisk walking, climbing several flights of stairs or exercising.

A gradual reduction in activity can also hide the problem. If someone stops exercising because they feel less comfortable during physical activity, they may not recognise that the lungs-not simply age or fitness-could be contributing.

Persistent cough, regular phlegm, wheezing, unexplained breathlessness or a noticeable reduction in exercise tolerance should therefore not simply be dismissed as the price of living in a city.

Can anything be done after decades of exposure?

Yes. The past cannot be changed, but future exposure can be reduced.

"Avoiding tobacco smoke is particularly important. During days of very poor air quality, reducing prolonged outdoor exertion can lower exposure. Good ventilation and attention to indoor pollution also matter, because moving indoors does not automatically mean moving into clean air," advised Dr Nagalla.

For people with persistent respiratory symptoms or significant exposure histories, a pulmonologist may recommend lung function testing such as spirometry. This is a simple test that can identify airflow limitation and provide a more objective picture of how the lungs are functioning.

The important point is not to wait for severe breathlessness before checking lung health.

The lungs remember more than a bad-air day

"Years of living in a polluted city do not automatically mean that the lungs are permanently damaged. Individual risk depends on the intensity and duration of exposure, smoking history, occupational exposures, underlying lung conditions and several other factors," shared Dr Nagalla.

But prolonged exposure should not be treated as harmless simply because there are no dramatic symptoms.

Bottomline

Dr Nagalla concluded, "The effects of pollution can accumulate quietly. Protecting the lungs is therefore not only about avoiding a particularly bad pollution day. It is about reducing the total burden of exposure over years-and recognising that preserving lung function is much easier than trying to recover it after significant damage has occurred."

Disclaimer: The information provided in this article is for general informational and educational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or a qualified healthcare provider with any questions you may have regarding a medical condition.